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filters

We're collecting a range of resources from communities and projects focused on water and air filtering.
(Lead image: @shanlter)
This page needs organizational help! Please help by tagging content with `filters` or with `air-filters` or `water-filters`. Thanks!
## Questions
[questions:filters]
### Water filtering
[nodes:water-filters]
### Air filtering
[nodes:air-filters]
## Activities
[notes:grid:activity:filters]